18-11-2017, 07:47 AM
FWIW on Tektronix scopes the calibrator has a jumper that puts the circuit into DC mode by disconnecting the feedback on the 1kHz oscillator. That enables you to use a DVM to accurately set the level. Then when the jumper is moved to a "parked" position the oscillator starts up again - but now the square wave amplitude is accurate.
